The TerraGuard Rapid Flow Curb Drain Filter is designed with multiple flow channels that allow water to flow from all directions, while leaving the soil and debris behind. This flexible tube containing lightweight, plastic rocks encapsulated in a high-strength knitted fabric has five times the flow rate of gravel and is tough enough to withstand heavy wheel loads. Hanes Geo Components. 252-235-4300. www.hanesgeo.com